Regarding BTC

coinmarketcap is a good place to check all cryptos.

Atleast $100-$500. Lower than that number won't give you much of an equity even if it pumps 10-50x (which won't happen after days/weeks/months)

But if you are hodling, go with that number and you can gain bigger profit if the price doubles after another 10 years.

If you want to invest? Start putting in $20 - $10000 (Whatever you can afford) on a daily basis.

This will grow exponentially over the next 4 years!

Small investments over time seems to be the way to go these days, though with the way the market seems to be heading it's anyones guess.

Though BTC is on sale now

Market cap wise, your $10 is unlikely to turn into anything major

Even the most optimistic BTC estimates see it at 5x from now. So if you're really lucky, you'll make $40 profit

This is good time for investment you can invest and check it after few months.

you better off investing that $10 in dogecoin or something - $10 btc wont change alot

btc will hit 70k soon